How to intercept applied_price?

[Nicola Grippaldi]

I'm experimenting on indicators and I wrote a simple SMA using iMA function, it works well just for program fixed applied_price (PRICE_CLOSE).

//+------------------------------------------------------------------+
//|                                                       SMA_03.mq5 |
//|                        Copyright 2015, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2015, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots   1
//---- plot MA
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrRed
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1
//--- input parameters
input int                period=13;
input int                shift=0;
//--- indicator buffers
double                   MABuffer[];
//--- indicator handle
int                      ma_handle;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
   SetIndexBuffer(0,MABuffer,INDICATOR_DATA);
   PlotIndexSetString(0,PLOT_LABEL,"SMA("+(string)period+")");
//---
   ma_handle=iMA(Symbol(),0,period,shift,MODE_SMA,PRICE_CLOSE);    // <================================
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,    
                const int prev_calculated,
                const int begin,
                const double &price[])
  {
   if(BarsCalculated(ma_handle)<rates_total) return(0);
   int to_copy;
   if(prev_calculated==0) to_copy=rates_total;
   else
     {
      to_copy=rates_total-prev_calculated;
      //--- last value is always copied
      to_copy++;
     }
   if(CopyBuffer(ma_handle,0,0,to_copy,MABuffer)<=0) return(0);   
   return(rates_total);
  }
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   IndicatorRelease(ma_handle);
  }
//+------------------------------------------------------------------+

I didn't found a way to intercept and use the starting program selection "Parameters - Apply to:" instead, is it possible?

Thanks.

[Alain Verleyen]

Nicola Grippaldi:

I'm experimenting on indicators and I wrote a simple SMA using iMA function, it works well just for program fixed applied_price (PRICE_CLOSE).

I didn't found a way to intercept and use the starting program selection "Parameters - Apply to:" instead, is it possible?

Thanks.

Apply to what ?

[Nicola Grippaldi]

I intend this kind of selection https://c.mql5.com/2/0/price_for_calculations.png

and set corresponding value as applied_price parameter in iMA.

ma_handle=iMA(Symbol(),0,period,shift,MODE_SMA,value);

[Alain Verleyen]

Nicola Grippaldi:

I intend this kind of selection https://c.mql5.com/2/0/price_for_calculations.png

and set corresponding value as applied_price parameter in iMA.

I know what's your intention. But I asked you on what values you want to apply iMA.

Instead of price, you can use an handle of an other indicator.

[Nicola Grippaldi]

Yes! this works very well indeed

   ema_handle=iMA(Symbol(),0,ema_period,0,MODE_EMA,PRICE_CLOSE);  
   sma_handle=iMA(Symbol(),0,sma_period,sma_shift,MODE_SMA,ema_handle);  

but now I would like to start the chain, I would like to apply my indicator to any other opened indicator on the graph, just like an usual indicator having  a single data buffer OnCalculate

[Alain Verleyen]

Nicola Grippaldi:

Yes! this works very well indeed

but now I would like to start the chain, I would like to apply my indicator to any other opened indicator on the graph, just like an usual indicator having  a single data buffer OnCalculate

So what ?

[Nicola Grippaldi]

"Previous Indicator's Data"

[Alain Verleyen]

Nicola Grippaldi:
"Previous Indicator's Data"

Already answered, get an handle to the indicator you want and use it instead of price. Please do some efforts and read the documentation: ChartIndicatorGet().

[Nicola Grippaldi]

Alain Verleyen:
Already answered, get an handle to the indicator you want and use it instead of price. Please do some efforts and read the documentation: ChartIndicatorGet().

oops

thanks

[Nicola Grippaldi]

Very good, ChartIndicatorGet() works fine.
I've defined an enumeration and an input field to select "close", "open", "previous indicator's data" ecc... and build the handle for passing it to iMA.

I dislike only the duplicated input structure and the fake functionality for "Parameters - Apply to:", but no matter.

PS: Solved, I use multiple data buffer form OnCalculate